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|Title:||Engineering kinetic barriers in copper metallization|
Wei, H. L.
Zhang, X. X.
Integrated circuit metallisation
Scanning electron microscopy
|Publisher:||American Institute of Physics|
|Source:||Applied physics letters, 2 Dec. 2002, v. 81, no. 23, 4359, p. 1-3|
|Abstract:||In metallization processes of integrated circuits, it is desirable to deposit the metal lines (aluminum or copper) fast and at low temperatures. However, the lines (films) usually consist of undesirable columns and voids, because of the absence of sufficient diffusion—a direct result of large kinetic barriers. Following the proposal and realization of the three-dimensional Ehrlich-Schwoebel (3D ES) barrier, we present here a method to engineer this kinetic barrier so as to improve quality of deposited copper films. We deposit copper films by magnetron sputtering, characterize the film structure and texture by using the scanning electron microscope and the x-ray diffraction, respectively. Taking indium as surfactant during copper deposition, we have achieved much better density and bottom coverage of copper filled trenches. The characterizations show that the improvement is the result of the 3D ES barrier reduction caused by indium addition. Engineering the 3D ES barrier therefore leads to improved film quality.|
|Rights:||© 2002 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Hanchen Huang et al, Appl. Phys. Lett. 81, 459 (2002) and may be found at http://link.aip.org/link/?apl/81/4359|
|Appears in Collections:||ME Journal/Magazine Articles|
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